Radiation affects most remarkably those tissues of the body that are in a steady state of renewal, such as hemopoietic tissues, gastro-intestinal tract, skin and testes. Radiation effects may be subtle and not expressed for many years, or they may be acute coming on promptly and producing severe symptomatology related to the central nervous system, the gastrointestinal tract or the hematopoietic system. All radiation effects have distinct dose-effect relationships which are reasonably well established. The symptomatology will also vary, depending upon whether the entire body is exposed or whether only a portion of the body has been exposed. Dose rate, the type of radiation, the distribution of absorbed dose within the body, fractionation and oxygen tension of tissues are all factors that influence the intensity and the type of radiation effect that may be observed at various time intervals after the exposure.
KeywordsDose Rate Ionize Radiation Radiation Injury Cosmic Radiation Relative Biological Effectiveness
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